Well, this Stompers catalog gallery shows some military vehicles, and some sci-fi oddballs, but nothing that I've noticed matches Veef's toy, though there are some cool halftracks and stuff in the military assortment.

Anyway, if Veef's toy is from some minor copycat line, it may be harder to track down. Certainly not Matchbox's "Rough Riders", which Wikipedia mentions as a Stompers copycat, because there's no Matchbox logo.